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Correlation between average peripheral plasma testosterone (T) levels (in nmol l−1) while exposed to MHC-similar and to MHC-dissimilar mares (Kendall's τ = 0.67, p = 0.003). Stallions were either first exposed to an MHC-dissimilar mare and then to MHC-similar ones (open circle) or vice versa (filled circle). The line gives the regression over all treatment groups.
